The middle speed change mechanism can be installed on the bicycle or the power-assisted bicycle through the support, speed change of the bicycle can be achieved through the device, and the middle speed change mechanism is used for replacing traditional rear inner speed change and chain type speed change. The multi-stage speed change mechanism is formed by matching a plurality of groups of ratchet gears and an output shaft gear, and multi-stage speed change is realized by utilizing a coupling structure of the ratchet gears at different axial positions and the opposite pawls at different positions. A plurality of pawls are evenly distributed on a pawl nest shaft, ratchet gears with different tooth numbers are sleeved outside the pawls, ratchet structures are arranged in inner holes of the gears, and the pawls arranged at different axial positions on the pawl nest shaft are jacked up through axial movement of cam sleeves in the inner holes of the pawl nest shaft to be coupled with ratchets on the ratchet gears, so that the gears and the pawl nest shaft rotate synchronously. The coupled ratchet gear is meshed with an output gear on the output shaft to achieve the purpose of outputting torque, and different ratchet gears on the pawl nest shaft are coupled with corresponding ratchets to achieve the purpose of different gear ratios.

    本发明提供了一种可通过支架安装在自行车或助力自行车上的中置变速机构,该装置可以使自行车实现变速,使用中置变速机构取代传统的后内变速及链条式变速。本发明由多组棘齿齿轮和输出轴齿轮配合组成,利用不同轴向位置的棘齿齿轮与相对的棘爪在不同位置的耦合结构实现多级变速。在棘爪窝轴上均布若干个棘爪,其外部套有不同齿数的棘齿齿轮,齿轮内孔有棘齿结构,通过棘爪窝轴内孔的凸轮套的轴向移动顶起排列安装在棘爪窝轴上不同轴向位置的棘爪与棘齿齿轮上的棘齿耦合,使该齿轮与棘爪窝轴同步转动,耦合的棘齿齿轮又与输出轴上的输出齿轮啮合达到输出转矩的目的,棘爪窝轴上的不同棘齿齿轮与对应棘齿耦合,以达到不同变速比的目的。


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    Title :

    Middle speed change mechanism of bicycle


    Additional title:

    一种自行车中置变速机构


    Contributors:
    XU KAIBO (author)

    Publication date :

    2023-06-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer




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